2021 Toyota Sienna Vehicle speed control Problems

“Sometimes when each of us 2 are slowing to a stop while applying the brake, the Sienna will lunge forward. This unexpected event may cause a rear-end collision if too close. Also, it is enough to cause us to hit our head on the head rest. Can’t understand why this happening. We are sure we only have our foot on the brake and not the accelerator.”

“We were driving down the freeway when we got rear ended hard by a large pickup. Then we lost electrical and engine power. The brakes stopped working. The hazard lights stopped working. Luckily we were able to coast to a complete stop as there was no way to stop the car. The police came and took a report. Then the car was towed to a body shop. We're awaiting the insurance company adjuster for inspection.”

“This incident had happened twice in the last 30 days. I have been stopped, then starting to accelerate after a stop sign, I push on the accelerator and the vehicle slows down, as if it’s losing power for about 5 seconds. I do not release the accelerator and after the 5 seconds of what feels like no power, the van begins to accelerate like normal. This poses a severe safety risk while crossing intersections when you believe your vehicle should respond when pushing on the accelerator. …”

“When my car is going down a steep hill and I have the brake applied, Suddenly the car will speed up and lurch forward instead of continuing to slow down. This is not how cars normally behave in the 30 years I have been driving. I could have slammed into the car in front of me. This has happened over 100 times. My vehicle has approximately 27,000 miles and I have mentioned it at the Toyota service center and it has been checked out and there are no issues that they see. No warning, lamps or messages appear at all”

“Since we have owned the vehicle (April 2021), we've had three separate incidences where, when pulling out into traffic from a stop, and the accelerator (gas pedal) is pushed, the vehicle begins to move, but then power is immediately lost, leaving you stuck for a moment. Each time has been temporary, and when the pedal is released and depressed again, the vehicle begins moving. However, this sudden loss of acceleration and few second delay in movement of the vehicle now in the path of oncoming traffic can lead to an accident. The most recent occasion happened on July 24, 2023. …”